AN ENERGY-BASED MODELING OF SAND AND ITS FEM APPLICATION

Abstract eng:
The paper describes a non-linear three-component model (an elasto-viscoplastic model) consisting of a hypo-elastic component connected in series to a combination of non-linear inviscid and viscous components connected in parallel. The hardening function for the inviscid component is an anisotropic relationship between a stress parameter and the modified irreversible strain energy, which is independent of stress path. The viscous component exhibits a nonlinear viscous property. Inherent and stress system-induced cross-anisotropic elasticity and strain localization into a shear band(s) having a thickness that is a function of particle size are considered. The FEM code incorporating the above-proposed model is validated by a direct comparison between the results from the FEM analysis and corresponding plane strain compression tests and model footing bearing capacity tests of unreinforced and reinforced Toyoura sand.

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